| http://purl.obolibrary.org/obo/MAT_0000445 | olfactory epithelium | | |
| abdomen | http://purl.obolibrary.org/obo/MAT_0000298 | abdomen | |
| adult abdomen | http://purl.obolibrary.org/obo/MAT_0000298 | abdomen | |
| abdominal sensillum | http://purl.obolibrary.org/obo/MAT_0000206 | abdominal sensillum | |
| accumbens nucleus | http://purl.obolibrary.org/obo/MAT_0000512 | accumbens nucleus | |
| adrenal cortex | http://purl.obolibrary.org/obo/MAT_0000494 | adrenal cortex | |
| adrenal medulla cell | http://purl.obolibrary.org/obo/MAT_0000071 | adrenal gland | |
| adrenal gland | http://purl.obolibrary.org/obo/MAT_0000071 | adrenal gland | |
| adrenal medulla | http://purl.obolibrary.org/obo/MAT_0000495 | adrenal medulla | |
| adult stage | http://purl.obolibrary.org/obo/MAT_0000403 | adult stage | |
| aggregation territory | http://purl.obolibrary.org/obo/MAT_0000322 | aggregation territory | |
| amniotic fluid | http://purl.obolibrary.org/obo/MAT_0000318 | amniotic fluid | |
| amphibia (AAO) | http://purl.obolibrary.org/obo/MAT_0000523 | amphibia (AAO) | |
| amygdala | http://purl.obolibrary.org/obo/MAT_0000289 | amygdala | |
| anal region | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| anus | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| anal canal | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| cloaca | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| cloacal chamber | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| anal pad | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| anal region | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| anatomical modifier | http://purl.obolibrary.org/obo/MAT_0000476 | anatomical modifier | |
| anatomy basic component | http://purl.obolibrary.org/obo/MAT_0000000 | anatomy basic component | |
| animal component | http://purl.obolibrary.org/obo/MAT_0000001 | animal component | |
| animal stage | http://purl.obolibrary.org/obo/MAT_0000391 | animal stage | |
| anlage | http://purl.obolibrary.org/obo/MAT_0000478 | anlage | |
| antenna | http://purl.obolibrary.org/obo/MAT_0000086 | antenna | |
| aorta | http://purl.obolibrary.org/obo/MAT_0000035 | aorta | |
| dorsal aorta | http://purl.obolibrary.org/obo/MAT_0000035 | aorta | |
| apical | http://purl.obolibrary.org/obo/MAT_0000484 | apical | |